\textit{Panel A: Two time blocks}
&
\multicolumn{2}{c}{
Labor
}
&
\multicolumn{2}{c}{
Materials
}
&
\multicolumn{2}{c}{
Capital
}
\\
                    &\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}\\
    &&\\ \hline  
1845-1879:          &       1.571&       0.315&       0.643&       0.199&       0.220&       0.076\\
\addlinespace
1880-1913:          &       0.326&       0.531&       0.143&       0.145&       0.101&       0.051\\
 && \\  \hline     
\textit{Panel B: time trend in labor coefficient}
&
\multicolumn{2}{c}{
Labor
}
&
\multicolumn{2}{c}{
Labor*Year
}
&
\multicolumn{2}{c}{
Year
}
\\
                    &\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}\\
    &&\\ \hline  
Coefficient:        &       2.379&      16.010&      -0.001&       0.009&       0.012&       0.152\\
 && \\  \hline     
\textit{Panel C: time trend in productivity}
&
\multicolumn{2}{c}{
Labor
}
&
\multicolumn{2}{c}{
Labor*Year
}
&
\multicolumn{2}{c}{
Year
}
\\
                    &\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}\\
    &&\\ \hline  
Coefficient:        &       2.379&      16.010&      -0.001&       0.009&       0.012&       0.152\\
 && \\  \hline     
